I have a powerbook g4 400 with the ati rage card. I use the latest ppc sources and I append video=atyfb in the yaboot.conf file. When I play around with Xwindows everything works, but when I want to play a game like gltron that uses 3d, it is really undoable. I enbled DRI and option usefb in the XFconfig file.

I suspect there's something wrong with the settings for this card, I also though that it could use normal memory from the computer to boost up the 8mb it normally has. When booting everything seems fine except for a couple of messages:

also, my video card has 8mb ram. this means you cannot run the glx extension (well, you cant use the direct rendering portions aka acceleration) at 24bpp. you have to run at 16bpp. the loss of colors makes little to no difference from what ive seen, however (and im a picky person in these matters). if your card has 8mb ram, you will have to do the same for direct rendering.